MX1102A CO2 Temp RH Data Logger for Indoor Air Quality Monitoring

MX1102A data logger measures: Carbon Dioxide up to 5,000 ppm, Temperature, Relative Humidity and Dew Point. Store measurement data up to 84,650. Data can be downloaded via USB 2.0 or Bluetooth.


Monitoring indoor air quality(IAQ) help building occupants feel comfortable. All types of commercial buildings, conference centers, shopping malls, hotels, medical offices, schools should continuously monitor essential IAQ parameters and comfort conditions like Carbon Dioxide, temperature and relative humidity. CO2 concentration is a primary indicator of indoor air quality. Poor air quality due to excessive concentrations of CO2 can cause tiredness, lack of concentration and even illness.

Onset's HOBO MX1102A data logger makes it more convenient than ever to measure and record CO2, temperature and relative humidity in buildings and other non-condensing environments. It measures CO2 from 0 - 5,000 parts per million (ppm), temperature from 0° to 50°C  - and our free HOBOconnect app* allows you to access data right from your mobile phone or tablet within a 100-foot range.

MX1102A also features a USB port so it can be used with a computer running HOBOware graphing and analysis software.

Contact ELFIN to learn more about the benefits of continuous indoor air quality monitoring. We can help you to be better informed of your building's indoor air quality.

Key Features

• Wireless communication via Bluetooth Low Energy (BLE) Technology
• Six month battery life at 5-minute CO2 logging rate
• Easy to deploy and offload using free HOBOmobile App
• Visual and audible high & low alarm thresholds
• Self-calibrating NDIR CO2 sensor technology ensures optimal accuracy and lower maintenance costs
• Patented connectivity technology

In what environment does this data logger operate?
This data logger operates in an indoor environment.

What measurements does this data logger support?
The MX1102A data logger supports the following measurements: Carbon Dioxide, Dew Point, Relative Humidity and Temperature.



The country of origin for this product is the United States.

Temperature Sensor



0° to 50°C (32° to 122°F) 

±0.21°C from 0° to 50°C (±0.38°F from 32° to 122°F)



0.024°C at 25°C (0.04°F at 77°F)

<0.1°C (0.18°F) per year

RH Sensor
Range 1% to 90% RH (non-condensing)
Accuracy ±2% from 20% to 80% typical to a maximum of ±4.5% including hysteresis at 25°C (77°F); below 20% and above 80% ±6% typical
Resolution 0.01%
Drift <1% per year typical
CO2 Sensor

Operating Range

0 to 5,000 ppm

Accuracy ±50 ppm ±5% of reading at 25°C (77°F), less than 90% RH non-condensing and 1,013 mbar

Warm-up Time

15 seconds


Auto or manual to 400 ppm


Temp. Response Time

RH Response Time

CO2 Response Time

Transmission Range

Wireless Data Standard

Logger Operating Range

12 minutes to 90% in airflow of 1 m/s (2.2 mph)

1 minute to 90% in airflow of 1 m/s (2.2 mph)

1 minute to 90% in airflow of 1 m/s (2.2 mph)

Approximately 30.5 m (100 ft) line-of-sight

Bluetooth Smart (Bluetooth Low Energy, Bluetooth 4.0)

0° to 50°C (32° to 122°F); 0 to 95% RH (non-condensing)

Logging Rate 1 second to 18 hours
Memory Modes Wrap when full or stop when full

Start Modes

Immediate, push button, date & time, or next interval

Stop Modes When memory is full, push button, date & time, or after a set logging period
Time Accuracy ±1 minute per month at 25°C
Power Source 4 AA 1.5 Volt batteries (user replaceable) or USB power source (5 V DC, 2 Watts)
Battery Life 6 months, typical with logging and sampling intervals of 5 minutes or slower


128 KB (84,650 measurements, maximum)

Download Type USB 2.0 interface or via Bluetooth Smart

Full Memory Download Time

20 seconds via USB; approximately 60 seconds via Bluetooth Smart, may take longer the further the device is from the logger

LCD LCD is visible from 0° to 50°C (32° to 122°F); the LCD may react slowly or go blank in temperatures outside this range
Size 7.62 x 12.95 x 4.78 cm (3.0 x 5.1 x 1.88 inches)
Weight 267.4 g (9.43 oz)
Environmental Rating IP50